Emotion, Pain, & Sentience

Pain issues in poultry

This review highlights the possible pain experienced by layer and broiler poultry in modern husbandry conditions. Receptors which respond to noxous stimulation (nociceptors) have been identified and physiologically characterised in many different part of the body of the chicken including...

Year Published: 2011Topics: Abnormal/Problematic Behavior, Body Modification/Mutilation, Emotion, Pain, & SentienceAnimal Type: Bird, Chicken

Citation: Gentle, M. J. 2011. Pain issues in poultry. Applied Animal Behaviour Science 135(3), 252–258.

Aggressive encounters lead to negative affective state in fish

Animals show various behavioural, neural and physiological changes in response to losing aggressive encounters. Here, we investigated affective state, which are emotion-like processes influenced by positive or negative experiences, in a territorial fish following aggressive encounters and explore links to...

Year Published: 2020Topics: Emotion, Pain, & SentienceAnimal Type: Fish, Other Fish

Citation: Rogers, L., Sales, E., Shamsi, S. et al. 2020. Aggressive encounters lead to negative affective state in fish. PLOS ONE 15(4), e0231330.

Do arthropods respond to noxious stimuli purely by reflex?

Mikhalevich & Powell (2020) argue that it is wrong to dismiss the idea of sentience in invertebrates. Here, I expand on the evidence for crustaceans responding to noxious stimuli in ways that are not explained by mere reflexes, and that...

Year Published: 2020Topics: Emotion, Pain, & SentienceAnimal Type: Crustacean, Invertebrate

Citation: Elwood, R. W. 2020. Do arthropods respond to noxious stimuli purely by reflex? Animal Sentience 29(10).

Similar levels of emotional contagion in male and female rats

Emotional contagion, the ability to feel what other individuals feel without necessarily understanding the feeling or knowing its source, is thought to be an important element of social life. In humans, emotional contagion has been shown to be stronger in...

Year Published: 2020Topics: Emotion, Pain, & SentienceAnimal Type: Rat, Rodent

Citation: Han, Y., Sichterman, B., Maria, C. et al. 2020. Similar levels of emotional contagion in male and female rats. Scientific Reports 10(1), 2763.

An adapted Qualitative Behavioural Assessment of dogs’ facial expressions of fear and frustration

Qualitative Behavioural Assessment (QBA) involves the quantification of people’s holistic interpretations of the style and quality of movement and has been used to assess the emotional states of many species, including dogs. Faces are a rich source of emotional expression,...

Year Published: 2025Topics: Emotion, Pain, & SentienceAnimal Type: Dog

Citation: Wilson, B. M., Correia-Caeiro, C., Mills, D. S. 2025. An adapted Qualitative Behavioural Assessment of dogs’ facial expressions of fear and frustration. Applied Animal Behaviour Science 292, 106828.

Tortoise Husbandry and Welfare

Keeping captive tortoises healthy and well is a significant challenge. Because they are ectotherms, these reptiles are totally dependent upon external sources to maintain body temperature and therefore metabolic function. Their physical environment is vital for them to remain healthy,...

Year Published: 2024Topics: Emotion, Pain, & Sentience, Husbandry & Management, Natural Behavior, Social Housing & Companionship, Welfare AssessmentAnimal Type: Reptile, Turtle & Tortoise

Citation: Williams, J. 2024. Tortoise Husbandry and Welfare. CABI, 303 pages.

Adult chicken hens express their affective states via bare facial skin blushing and head feather movements

In mammals, facial expressions serve as a window into a variety of affective states. Emotional facial expressions in birds have received little scientific attention. Juvenile hens showed variations in their facial display, facial redness and head feather position, depending on...

Year Published: 2025Topics: Emotion, Pain, & SentienceAnimal Type: Bird, Chicken

Citation: Soulet, D., Love, S. A., Blache, M.-C. et al. 2025. Adult chicken hens express their affective states via bare facial skin blushing and head feather movements. Animal Behaviour 227, 123277.

A case of thanatosis in domestic sheep

Thanatosis (feigning death, defensive tonic immobility) is a widespread anti-predator behavioural strategy in animals. Animals that have evolved this behaviour react to physical contact with the predator by displaying a persistent tonic immobility that makes them look like dead prey....

Year Published: 2025Topics: Emotion, Pain, & Sentience, Natural BehaviorAnimal Type: Sheep

Citation: Skok, J., Prevolnik Povše, M., Škorjanc, D. 2025. A case of thanatosis in domestic sheep. Behaviour 162(6–8), 569–578.

Grief-like distress responses in horses after the death of a conspecific

As a social species, it would be anticipated that horses may display altered behaviours toward dying or dead conspecifics. However, there is remarkably little literature on this subject. The aim of this study was to identify behavioural changes in horses...

Year Published: 2025Topics: Emotion, Pain, & SentienceAnimal Type: Equine

Citation: Ricci-Bonot, C., Wilson, E., Uccheddu, S. et al. 2025. Grief-like distress responses in horses after the death of a conspecific. Applied Animal Behaviour Science 292, 106799.

Do the ear and tail positions reflect the emotional state of calves?

This study aimed to determine the associations between ear and tail position and stroking or umbrella stimuli in dairy calves at different stimulus application times (before the test, pretest, test, and posttest). Thirty-two mixedbred Holstein calves of different ages were...

Year Published: 2024Topics: Emotion, Pain, & Sentience, Welfare AssessmentAnimal Type: Cattle

Citation: Machado, M., Silveira, R. M. F., Bittar, C. M. M. et al. 2024. Do the ear and tail positions reflect the emotional state of calves? Journal of Animal Behaviour and Biometeorology 12(2), e2024017.